420890669 has 2 divisors, whose sum is σ = 420890670. Its totient is φ = 420890668.

The previous prime is 420890653. The next prime is 420890683. The reversal of 420890669 is 966098024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 332624644 + 88266025 = 18238^2 + 9395^2 .

It is a cyclic number.

It is not a de Polignac number, because 420890669 - 2⁴ = 420890653 is a prime.

It is a super-2 number, since 2×420890669² = 354297910502535122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420898669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210445334 + 210445335.

It is an arithmetic number, because the mean of its divisors is an integer number (210445335).

Almost surely, 2^420890669 is an apocalyptic number.

It is an amenable number.

420890669 is a deficient number, since it is larger than the sum of its proper divisors (1).

420890669 is an equidigital number, since it uses as much as digits as its factorization.

420890669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 420890669 is about 20515.6201222386. The cubic root of 420890669 is about 749.4162384886.

The spelling of 420890669 in words is "four hundred twenty million, eight hundred ninety thousand, six hundred sixty-nine".